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(A) Electrochemical CV responses of bare GC electrode (a),G/GNP (b) G/GNP/Ab1 (c), G/GNP/Ab1/Ag(d), and G/ GNP/Ab1/Ag/Ab2 (e). (B) Electrochemical impedance spectra of bare GC electrode (a), G/GNP (b), G/GNP/Ab1 (c), G/GNP/Ab1/Ag(d), and G/ GNP/Ab1/Ag/Ab2 (e), (C) Effects of the incubation time. (D) And volume for GO/ AuNPs /Ab2 nanoprobes on the Δip of the sensor. All measurements were recorded in 0.1 M KCl solution containing 4 mM [Fe(CN)6]4−/3−
